package string;

public class StringBuilderDemo1 {
    public static void main(String[] args) {
        String str = "好好学习Java";

        StringBuilder builder = new StringBuilder(str);

//        String st = "斤斤计较军";
//
//        System.out.println(str);

        builder.append(",为了找个好工作！");

        System.out.println(str);

        System.out.println(builder);


        System.out.println(str);

        builder.replace(9,16,"就是为了改变世界.");
        System.out.println(builder);

        builder.delete(0,8);
        System.out.println(builder);

        builder.insert(0,"活着");
        System.out.println(builder);

//        builder.insert(2,"活着");
//        System.out.println(builder);


        builder.reverse();
        System.out.println(builder);

        String li = builder.toString();
        System.out.println(li);




        StringBuilder builder1 = new StringBuilder(str);








    }
}
